Inconsistent issues with loading INuiInstanceHelper in Kinect SDK

I've found this issue and potential resolutions to this issue both here and on the MSDN forums but my problem is a little different. When I call the ctor on the Runtime class, I get this exception:

System.IO.FileNotFoundException: Could not load file or assembly 'INuiInstanceHelper, Version=1.0开发者_开发技巧.0.10, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies.

I do not get this error when constructing the Runtime in a simple scenario (e.g. a Loaded event in WPF. see my simple scenario code below).

In my real scenario, my Runtime's ctor is called when a user opens a file from an open file dialog. This is kicked off from a MenuItem command in a ViewModel, which uses a "service" that wraps the open file dialog. The ViewModel then initializes the Runtime after the file path is specified:

void ExecuteOpenCommand()
{
    var path = this.openFileService.OpenFile();

    if (!string.IsNullOrEmpty(path))
    {
        var model = ViewModelLoader.ReadMainModel(path);
        var viewModel = ViewModelLoader.LoadViewModel(model);
        this.MainViewModel = viewModel;
        this.MainViewModel.NuiService = this.nuiService;
        this.nuiService.Initialize();
    }
}

The nuiService just constructs the Runtime if it has never been initialized before:

bool initialized;
public void Initialize()
{
    if (initialized)
    {
        return;
    }

    try
    {
        this.runtime = new Runtime();
    }
    catch (FileNotFoundException ex)
    {
        Trace.WriteLine(ex.ToString());
    }

    // ...
    initialized = true;
}

However, when I start a new WPF project from scratch and construct the runtime, I do not get this error:

// does not throw exception
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
    Runtime r = new Runtime();
    r.Initialize(RuntimeOptions.UseSkeletalTracking);
    r.Uninitialize();
}

When Googling this exception I've come across solutions that require updating DirectX, rebooting, updating Windows, or reinstalling INuiInstanceHelper to the GAC. I don't see how these solutions will help since I can construct the Runtime without error in a different way. I thought my problem must have something to do with it being user-initiated (e.g. from a Button Click), but when I moved the Runtime constructor to a method that gets executed near app startup (e.g. in the ctor of my ViewModel which is instantiated declaratively through data-binding) I still had the issue. Thoughts?

---

The answer was to change the Platform Target to x86. For some reason it got set to Any CPU. grrrr....